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The example ~/.bash_profile below is compatible with the Bourne shell and gives semantics similar to csh for the ~/.bashrc and ~/.bash_login. The [ -r filename] && cmd is a short-circuit evaluation that tests if filename exists and is readable, skipping the part after the && if it is not.
CRS—Computer Reservations System; CRT—Cathode-ray tube; CRUD—Create, read, update and delete; CS—Cable Select; CS—Computer Science; CSE—Computer science and engineering; CSI—Common System Interface; CSM—Compatibility support module; CSMA/CD—Carrier-sense multiple access with collision detection; CSP—Cloud service provider
In software engineering, profiling ("program profiling", "software profiling") is a form of dynamic program analysis that measures, for example, the space (memory) or time complexity of a program, the usage of particular instructions, or the frequency and duration of function calls.
Implementations of this feature can differ between shells; for example, PowerShell [44] and zsh [45] use an external module to provide completions, and fish derives its completions from the user's command history.
Generally, a shell is a program that executes other programs in response to text commands. A sophisticated shell can also change the environment in which other programs execute by passing named variables, a parameter list, or an input source.
The Computer Language Benchmarks Game site warns against over-generalizing from benchmark data, but contains a large number of micro-benchmarks of reader-contributed code snippets, with an interface that generates various charts and tables comparing specific programming languages and types of tests. [56]
Code injection is a computer security exploit where a program fails to correctly process external data, such as user input, causing it to interpret the data as executable commands. An attacker using this method "injects" code into the program while it is running.
[5] [24] It is a subfield of both computer science and education research, and is concerned with understanding how computer science is taught, learned, and assessed in a variety of settings, such as K-12 schools, colleges and universities, and online learning environments. [citation needed]